A kind of online welding method of circulating fan impeller

Abstract

The invention discloses a circulating fan impeller online welding method, and belongs to the field of equipment overhauling. The circulating fan impeller online welding method aims at improving the impeller crack treatment quality and comprises the sequentially-executed steps that a, cracks are removed, wherein U-shaped groove beveled edges are formed, and the cracks are removed; b, welding is carried out, wherein at least two layers of welding beads are adopted for welding, the overlapping pressure face between two adjacent layers of welding beads is not smaller than 1 / 3 of the width of an outer layer welding bead, each layer of welding bead is divided into three segments or two segments to be subject to backward welding, and a joint between two adjacent segments in each layer of welding bead should be staggered by at least 30 mm. According to the circulating fan impeller online welding method, through increasing of the welding throat depth, permeation is more sufficient, capacity of a welding line for bearing stress is improved, time of crack appearing in the welding line can be prolonged, and therefore the use time of an impeller after crack repairing is prolonged, the service life of the impeller is effectively prolonged, the welding line repairing frequency after impeller crack treatment is reduced, and the maintaining cost is saved.

Description

technical field [0001] The invention belongs to the field of equipment maintenance, in particular to an online welding method for a circulating fan impeller. Background technique [0002] The CDQ circulating fan is one of the most important production equipment for the tamping coke CDQ system in the ironworks. Whether its operation is normal or not is directly related to the smooth operation of the CDQ furnace. 1. The important task of steam delivery in ironworks, its good operation is directly related to the dry quenching rate of coke and the output of steam; the content of coke powder in the medium gas of circulating fan is generally 700~800mg / Nm 3 , gas coke powder content ≤ 2g / Nm 3 . The particle size distribution of residual coke in the secondary dust collector is as follows: 4.7% of which are ≤0.25mm; 12.1% of which are ≤0.25-1mm; 77.2% of which are ≤1-1.5mm; 5.6% of which are ≤1.5-3mm %; 0.4% of which are ≤3-5mm. The working system of the fan is 345 days a year, 2...

AI Technical Summary

Problems solved by technology

The working system of the fan is 345 days a year, 24 hours a day, so that the dust content is large, and the long-term operation will cause cracks in the fan impeller, resulting in the renewal of the impeller. In the past, the cracks of the large fan impeller were treated by opening the groove and directly welding.

However, the service time of the impeller after crack treatment is short, which seriously affects the normal production needs.

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